package Course13;

public class Test {
    public static void main(String[] args) {
        //字符串的拼接
        String a = null;
        String b = "00";
        String c = "12";
        String d = "34";
        a = b+c+d;
        System.out.println(a);

        String f = "hello";
        char[] ch = f.toCharArray();
        String g = String.valueOf(ch[1])+ch[2];
        System.out.println(g);
    }
}
